/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.runtime.controlprogram.parfor.opt;

import java.util.HashMap;
import java.util.Map;

import com.ibm.bi.dml.runtime.controlprogram.parfor.util.IDSequence;

/**
 * Helper class for mapping nodes of the internal plan representation to statement blocks and 
 * hops / function call statements of a given DML program.
 *
 */
public class OptTreePlanMapping 
{
	
	protected IDSequence _idSeq;
	protected Map<Long, OptNode> _id_optnode;
    
	public OptTreePlanMapping()
	{
		_idSeq = new IDSequence();
		_id_optnode = new HashMap<Long, OptNode>();
	}
	
	/**
	 * 
	 * @param id
	 * @return
	 */
	public OptNode getOptNode( long id )
	{
		return _id_optnode.get(id);
	}
	
	/**
	 * 
	 * @param id
	 * @return
	 */
	public long getMappedParentID( long id )
	{
		for( OptNode p : _id_optnode.values() )
			if( p.getChilds() != null )
				for( OptNode c2 : p.getChilds() )
					if( id == c2.getID() )
						return p.getID();
		return -1;
	}
	
	/**
	 * 
	 */
	public void clear()
	{
		_id_optnode.clear();
	}
	
}
